H pylori treatment
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"Helicobacter pylori" AND eradication treatment
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H. pylori Treatment
Indications for Treatment
Eradication is recommended in:
- Peptic ulcer disease (PUD) — gastric or duodenal, active or in remission, regardless of NSAID use
- Gastric MALT lymphoma — 60–90% achieve complete remission with eradication alone
- Uninvestigated dyspepsia (age <60, no alarm features) — ACG recommends test-and-treat
- Long-term NSAID/aspirin users, especially with prior PUD history
- Post-resection of early gastric cancer
- Unexplained iron-deficiency anemia or idiopathic thrombocytopenic purpura (ITP)
- Unexplained vitamin B12 deficiency (Maastricht VI/Florence consensus)
- First-degree relatives of gastric cancer patients; patients with atrophic gastritis or precancerous lesions
First-Line Regimens (14 days preferred)
| Regimen | Drugs | Dosing | Duration | Eradication Rate |
|---|---|---|---|---|
| Clarithromycin triple (only if no prior macrolide, local clarithromycin resistance <15%) | PPI (standard or double dose) + Clarithromycin 500 mg + Amoxicillin 1 g (or Metronidazole 500 mg if PCN-allergic) | BID | 14 days | 70–85% |
| Bismuth quadruple (now often preferred first-line) | PPI + Bismuth subcitrate 120–300 mg or subsalicylate 300 mg + Tetracycline 500 mg + Metronidazole 250–500 mg | PPI BID; others QID | 10–14 days | 75–90% |
| Concomitant | PPI + Clarithromycin 500 mg + Amoxicillin 1 g + Nitroimidazole 500 mg | BID | 10–14 days | ~90% |
| Sequential | Days 1–7: PPI + Amoxicillin; Days 8–14: PPI + Clarithromycin + Nitroimidazole | BID | 5+5 to 7+7 days | >90% |
| Levofloxacin triple | PPI + Levofloxacin 500 mg QD + Amoxicillin 1 g BID | — | 5–7 days | Comparable |
| Vonoprazan-based (FDA approved) | Vonoprazan + Amoxicillin ± Clarithromycin | BID | 14 days | May exceed PPI-based |
Key point: Bismuth quadruple therapy is now often recommended as first-line due to rising clarithromycin resistance. Clarithromycin triple therapy should only be used if local resistance is <15% and the patient has no prior macrolide exposure.
Salvage / Second-Line Therapy
- If clarithromycin triple was used first → switch to bismuth quadruple therapy
- Levofloxacin triple (PPI + levofloxacin + amoxicillin × 10 days) — data suggest better efficacy and tolerability than bismuth quadruple for persistent infection
- After two failed attempts → perform culture and sensitivity testing + specialist referral
- With appropriate 10–14 day regimen + compliance, eradication confirmed in ~85% on urea breath test
Post-Treatment
- Continue PPI or H2 blocker for a total of 4–6 weeks after completing antibiotics
- Confirm eradication ≥4 weeks after finishing antibiotics
- Preferred test: urea breath test (most accurate non-invasive method)
- Alternatively: stool antigen test
- Avoid serology — IgG can remain positive for months–years post-eradication (false positive)
- After documented eradication, maintenance antisecretory therapy is not needed unless patient requires long-term NSAIDs or anticoagulation
Commercially Available Combination Packs
- Prevpac: Lansoprazole + Amoxicillin + Clarithromycin
- Helidac: Bismuth subsalicylate + Metronidazole + Tetracycline
Why Eradication Matters
Documented eradication reduces ulcer recurrence dramatically:
- From ~67% (duodenal) and ~59% (gastric) → <10–20%
- Also reduces recurrent ulcer bleeding
Recent Evidence
A 2024 meta-analysis found rising global primary antibiotic resistance to clarithromycin and metronidazole, reinforcing the shift toward bismuth quadruple and culture-guided therapy [PMID: 38898622]. A 2025 systematic review confirmed that eradication therapy significantly reduces gastric cancer risk [PMID: 39824392].
Sources: Harrison's Principles of Internal Medicine 22E, p. 2570–2574; Textbook of Family Medicine 9e, p. 1126; Rosen's Emergency Medicine 9e, p. 1229
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